Double paned windows in Janie Barrera's home. Barrera has made green improvements to her nearly 100-year-old King William home without sacrificing the history of the house. Barrera has rigged rain catchers to plant her garden and has tankless hot water heaters in her home. less

Double paned windows in Janie Barrera's home. Barrera has made green improvements to her nearly 100-year-old King William home without sacrificing the history of the house. Barrera has rigged rain catchers to ... more

Janie Barrera has made green improvements to her nearly 100-year-old King William home without sacrificing the history of the house. Barrera has rigged rain catchers to plant her garden and has tankless hot water heaters in her home. less

Janie Barrera has made green improvements to her nearly 100-year-old King William home without sacrificing the history of the house. Barrera has rigged rain catchers to plant her garden and has tankless hot ... more

Photo: Helen L. Montoya, San Antonio Express-News

Janie Barrera has made green improvements to her nearly... Photo-4203512.56921 - San Antonio Express-News

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Double paned windows in Janie Barrera's home. Barrera has made green improvements to her nearly 100-year-old King William home without sacrificing the history of the house. Barrera has rigged rain catchers to plant her garden and has tankless hot water heaters in her home. less

Double paned windows in Janie Barrera's home. Barrera has made green improvements to her nearly 100-year-old King William home without sacrificing the history of the house. Barrera has rigged rain catchers to ... more

John Hertz shows a long hallway created by an addition to the back of the structure in his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces. less

John Hertz shows a long hallway created by an addition to the back of the structure in his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation ... more

Photo: Tom Reel, San Antonio Express-News

John Hertz shows a long hallway created by an addition to the back... Photo-4203514.56921 - San Antonio Express-News

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Taboola Gallery Frame Item-85307.56921 - San Antonio Express-News

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John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

Photo: Tom Reel, San Antonio Express-News

John Hertz shows his restored house near Brackenridge Park on... Photo-4203515.56921 - San Antonio Express-News

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John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

Photo: Tom Reel, San Antonio Express-News

John Hertz shows his restored house near Brackenridge Park on... Photo-4203516.56921 - San Antonio Express-News

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John Hertz shows the study in his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

John Hertz shows the study in his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

Photo: Tom Reel, San Antonio Express-News

John Hertz shows the study in his restored house near Brackenridge... Photo-4203517.56921 - San Antonio Express-News

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John Hertz shows the front bathroom in his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

John Hertz shows the front bathroom in his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

Photo: Tom Reel, San Antonio Express-News

John Hertz shows the front bathroom in his restored house near... Photo-4203518.56921 - San Antonio Express-News

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Taboola Gallery Frame Item-85307.56921 - San Antonio Express-News

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John Hertz shows the master bedrfoom in his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

John Hertz shows the master bedrfoom in his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

Photo: Tom Reel, San Antonio Express-News

John Hertz shows the master bedrfoom in his restored house near... Photo-4203519.56921 - San Antonio Express-News

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John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

Photo: Tom Reel, San Antonio Express-News

John Hertz shows his restored house near Brackenridge Park on... Photo-4203520.56921 - San Antonio Express-News

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John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

Photo: Tom Reel, San Antonio Express-News

John Hertz shows his restored house near Brackenridge Park on... Photo-4203521.56921 - San Antonio Express-News

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John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

John Hertz shows his restored house near Brackenridge Park on February 7, 2013. The house was completely overhauled with insulation installed in all exterior surfaces.

Photo: Tom Reel, San Antonio Express-News

John Hertz shows his restored house near Brackenridge Park on... Photo-4203522.56921 - San Antonio Express-News